500원,100원백동그러니까구리75%와니켈25%의합금/50원양백합금으로구리70%아연(Zn)18%니켈12%/10원옛날동전황동(구리65%,아연35%)새10원구리를씌운알루미늄
[무물보AI] 답변 로딩중...